参数资料
型号: XE8806AMI026TLF
厂商: Semtech
文件页数: 86/143页
文件大小: 0K
描述: IC MCU LOW PWR MTP FLASH 32-TQFP
标准包装: 1
系列: XE880x
应用: 感测机
核心处理器: Coolrisc816?
程序存储器类型: 闪存(22 kB)
控制器系列: XE8000
RAM 容量: 512 x 8
接口: UART,USRT
输入/输出数: 24
电源电压: 2.4 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 32-TQFP
包装: 剪切带 (CT)
供应商设备封装: 32-TQFP(7x7)
配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
其它名称: XE8806AMI026CT
Semtech 2006
www.semtech.com
7-8
XE8806A/XE8807A
The oscillator characteristics are given in Table 7-11. The characteristics are valid only if the crystal and board
layout meet the specifications above.
Symbol
Description
Min
Typ
Max
Unit
Comments
fXtal
Nominal frequency
32768
Hz
St_xtal
Start-up time
1
2
s
Fstab
Frequency deviation
-100
300
ppm
Note 1
Table 7-11. Crystal oscillator characteristics.
Note 1. This gives the relative frequency deviation from nominal for a crystal with CL=8.2pF and within the
temperature range -40
°C to 85°C. The crystal tolerance, crystal aging and crystal temperature drift are not
included in this figure.
7.8
External clock
7.8.1
External clock configuration
The user can provide an external clock instead of the internal oscillators. The external provided frequency is
internally divided by two. The external clock input pin is XIN.
The system is configured for external clock by bit EnExtClock in register RegSysClock. Using the bits in the
registers RegSysRcTrim1 and RegSysRcTrim2, the ck32kHz clock frequency can be controlled (see section
7.11).
Note: when using the external clock, the Xtal is not available.
7.8.2
External clock specification
The external clock has to satisfy the specifications in the table below. Correct behavior of the circuit can not be
guaranteed if the external clock signal does not respect the specifications below.
Symbol
Description
Min
Typ
Max
Unit
Comments
FEXT
External clock
frequency
8
MHz
Note 1
PW_1
Pulse 1 width
0.06
s
Note 1
PW_0
Pulse 0 width
0.03
20
s
Note 1
FEXT_LV
External clock
frequency
TBD
kHz
Note 2
PW_1_LV
Pulse 1 width
TBD
s
Note 2
PW_0_LV
Pulse 0 width
TBD
20
s
Note 2
Table 7-12. External clock specifications.
Note 1. For VBAT
≥2.4V
Note 2. For VBAT=VREG=1.2V
7.9
Clock source selection
There are three possible clock sources available for the CPU clock. The RC clock is always selected after power-
up, a negative pulse on NRESET or after Sleep mode. The CPU clock selection is done with the bit CpuSel in
RegSysClock (0= fastest clock, 1= 32 kHz from Xtal if EnableXtal =1 and EnExtClock = 0 else from high
prescaler 32 kHz output).
Switching from one clock source to another is glitch free.
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XE8807AMI026TLF 功能描述:IC MCU LOW PWR MTP FLASH 32-TQFP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器 - 特定应用 系列:XE880x 产品变化通告:Product Discontinuation 26/Aug/2009 标准包装:250 系列:- 应用:网络处理器 核心处理器:4Kc 程序存储器类型:- 控制器系列:- RAM 容量:16K x 8 接口:以太网,UART,USB 输入/输出数:- 电源电压:1.8V, 3.3V 工作温度:- 安装类型:表面贴装 封装/外壳:208-LQFP 包装:带卷 (TR) 供应商设备封装:PG-LQFP-208 其它名称:SP000314382